Mathematical model of site-maker for the formation sites around the stumps

10.12737/8465 ◽  
2015 ◽  
Vol 4 (4) ◽  
pp. 147-155
Author(s):  
Поздняков ◽  
Evgeniy Pozdnyakov
Keyword(s):  
Mathematical Model ◽  
Ground Level ◽  
System Of Equations ◽  
Cutting Machine ◽  
Flexible Working ◽  
Wear And Tear ◽  
Below Ground ◽  
Machine Elements ◽  
Working Bodies

Technological process and design of site-maker is proposed with flexible working bodies in the form of rope pieces, performing remote of the soil by sites around stumps for their grinding below ground level in order to improve the quality of tillers on cutting and efficiency of the cutting machine elements to reduce the stumps by reducing wear and tear resulting from their contact with soil particles. A mathematical model of site-maker is developed, system of equations describing the device as a whole and interaction of the elements of flexible working bodies, soil and stump one another are presented.

scholarly journals Patch-maker around stumps

10.12737/3361 ◽  
2014 ◽  
Vol 4 (1) ◽  
pp. 156-158
Author(s):  
Поздняков ◽  
Evgeniy Pozdnyakov
Keyword(s):  
Soil Removal ◽  
Ground Level ◽  
Below Ground ◽  
Hydraulic Manipulator ◽  
Working Bodies ◽  
Elastic Elements

Design of patch-maker is presented performing soil removal around the stump for its cleaning and lowering it below ground level to improve the performance of machines for grinding stumps, improve patency of tractor units and improve subsequent silviculture works in clearings. A device for increasing coverage, reducing the time and increasing productivity, is hung on boom of telescopic hydraulic manipulator. Working bodies of а patch-maker, with the aim of improving the quality of stump cleaning from dirt, are flexible and they are elastic elements in the form of pieces of rope.

scholarly journals EXPERIMENTAL CONFIRMATION OF EQUATIONS’ ADEQUACY OF GEOMETRIC CONNECTIONS IN THE MUNICIPAL MACHINE WITH THE BRUSH WORKING BODY PARALLELOGRAPHIC SUSPENSION

2019 ◽  
Vol 15 (6) ◽  
pp. 834-843
Author(s):  
S. D. Ignatov ◽  
S. I. Tsekhosh
Keyword(s):  
Mathematical Model ◽  
Hydraulic Cylinder ◽  
Clamping Force ◽  
Vertical Coordinate ◽  
Constraint Equations ◽  
Working Element ◽  
Machine Elements ◽  
Kinematic Diagram ◽  
The Mathematical Model

Introduction. The authors arise the question of increasing the efficiency of the municipal machine. Moreover, the influence of the clamping force of the brush body on the surface and on the brush deterioration and, as a consequence, on the quality of the roadway cleaning is highlighted in the article.Methods and materials. The results of the changing process of the brushing tool vertical coordinate in the municipal machine were presented, depending on the displacement of the hydraulic cylinder rod. The analysis of the existing types of the brushing working body suspension was carried out. As a result of such analysis, the authors established the most frequent usage of the three-point and parallelogram suspensions, the schemes of which were also presented in the article.Results. The equations of geometrical connections of the municipal machine elements, which could be used in mathematical model, are presented. In addition, the kinematic diagram of the municipal machine with the brush working body suspension is drawn up. Therefore, the  presented model takes into account such parameters as the length of the levers’ arms, the linear movements of the hinges, the rod stroke, the levers’ angles and the distances between the hinges. The methods and the course of the experiment for determining the displacement dependence of the brush body from the displacement of the hydraulic cylinder rod are described. The authors also present the photographs of the experimental research fragments.Discussion and conclusions. On the basis of the obtained data, the authors construct the experimental and theoretical dependences’ graph of the brush body displacement and the actuator hydraulic cylinder rod displacement. The analysis of such graphs confirms the adequacy of the geometric constraint equations and also proves that these equations could be used in the mathematical model of the position controlling process of the brush operating body and also for determination the optimum value of the brush working element clamping force to the surface.

scholarly journals Hydrogeological Conditions of the "Dhunge Dharas" in the Kathmandu Valley

1993 ◽  
Vol 9 ◽  
Author(s):  
R. Karmacharya ◽  
S. D. Shrestha ◽  
G. Krishna Rao
Keyword(s):  
Water Table ◽  
Ground Surface ◽  
Ground Level ◽  
Kathmandu Valley ◽  
Chemical Quality ◽  
Sloping Ground ◽  
Dug Wells ◽  
Below Ground ◽  
Ancient Times

Groundwater has been tapped in the Kathmandu valley since ancient times through the traditional stone-carved water-spouts called Dhunge Dharas and dug wells. Present study deals with hydrogeological situation of dug wells and Dhunge Dharas. Quality of groundwater is evaluated on the basis of pH versus topography. The Dharas are classified into natural types on slopes and artificial ones in the valley poor. Depth of water table is observed to be between nearly at ground surface to 6m below the sloping ground and exceptionally up to 12.25m below ground level (bg l) on the terraces. Chemical quality of groundwater is found to be good except at a few places.

Dynamics of the processes in metal machining

1998 ◽  
Vol 2 ◽  
pp. 115-122
Author(s):  
Donatas Švitra ◽  
Jolanta Janutėnienė
Keyword(s):  
High Frequency ◽  
Machine Tools ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Low Frequency ◽  
Metal Cutting Machine ◽  
Cutting Machine ◽  
Metal Machining

In the practice of processing of metals by cutting it is necessary to overcome the vibration of the cutting tool, the processed detail and units of the machine tool. These vibrations in many cases are an obstacle to increase the productivity and quality of treatment of details on metal-cutting machine tools. Vibration at cutting of metals is a very diverse phenomenon due to both it’s nature and the form of oscillatory motion. The most general classification of vibrations at cutting is a division them into forced vibration and autovibrations. The most difficult to remove and poorly investigated are the autovibrations, i.e. vibrations arising at the absence of external periodic forces. The autovibrations, stipulated by the process of cutting on metalcutting machine are of two types: the low-frequency autovibrations and high-frequency autovibrations. When the low-frequency autovibration there appear, the cutting process ought to be terminated and the cause of the vibrations eliminated. Otherwise, there is a danger of a break of both machine and tool. In the case of high-frequency vibration the machine operates apparently quiently, but the processed surface feature small-sized roughness. The frequency of autovibrations can reach 5000 Hz and more.

The Development of a Physico-Mathematical Model for the Functioning of an Underwater Waterjet Cutting Machine

2020 ◽  
Vol 75 (2) ◽  
pp. 167-174
Author(s):  
A. A. Ilukhina ◽  
V. I. Kolpakov ◽  
V. V. Veltishchev ◽  
A. L. Galinovsky ◽  
A. V. Khakhalin
Keyword(s):  
Mathematical Model ◽  
Waterjet Cutting ◽  
Cutting Machine

Multifactor mathematical model of criticality of welding process of products from aluminum- magnesium alloys

2020 ◽  
pp. 12-18
Author(s):  
F.A. Urazbahtin ◽  
A.YU. Urazbahtina
Keyword(s):  
Mathematical Model ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Welding Process ◽  
Welding Equipment ◽  
Equipment Operation ◽  
Aluminum Magnesium Alloys ◽  
Aluminum Magnesium Alloy ◽  
Welding Materials

A multifactor mathematical model of the welding process of products from aluminum-magnesium alloys, consisting of 71 indicators that assess the quality of the weld, the welding process, costs, equipment operation and quality of the welded material. The model can be used to control and optimize the welding process of products from aluminum-magnesium alloys. Keywords welding, products, aluminum-magnesium alloy, indicators, process parameters, welding equipment, welding materials, electrode sharpening, lining [email protected]

Network analysis models – the secret for success

2004 ◽  
Vol 4 (5-6) ◽  
pp. 383-388
Author(s):  
D.M. Rogers
Keyword(s):  
Mathematical Model ◽  
Field Data ◽  
Essential Element ◽  
Distribution Networks ◽  
Automatic Calibration ◽  
Supply And Distribution ◽  
The World ◽  
Optimum Approach ◽  
Analysis Models

Water is a fundamental necessity of life. Yet water supply and distribution networks the world over are old and lacking in adequate maintenance. Consequently they often leak as much water as they deliver and provide an unacceptable quality of service to the customer. In certain parts of the world, water is available only for a few hours of the day. The solution is to build a mathematical model to simulate the operation of the real network in all of its key elements and apply it to optimise its operation. To be of value, the results of the model must be compared with field data. This process is known as calibration and is an essential element in the construction of an accurate model. This paper outlines the optimum approach to building and calibrating a mathematical model and how it can be applied to automatic calibration systems.

Numerical Simulation on Mold Electromagnetic Eccentric Stirring and Central Segregation of Round Bloom

2013 ◽  
Vol 652-654 ◽  
pp. 2450-2454
Author(s):  
Zhi Hong Zhang ◽  
Guo Guang Cheng
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Electromagnetic Stirring ◽  
Center Line ◽  
Central Segregation

The paper describes multi-section round bloom casting using external MEMS, equipped with max section D600mm and min D280mm mold, the center line of D280mm mold not coincident with the axis of stirrer coils. it is exist eccentric electromagnetic stirring of mold which section less than max D600mm, a mathematical model of MEMS has been established, the index of central segregation of D280mm macrostructure had decreased less than 1.12 by optimized parameters of electromagnetic stirring and SEN immerse depth, in the end, the quality of round bloom had improved.

scholarly journals Results of Laboratory Studies of the Automated Sorting System for Root and Onion Crops

Agronomy ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1257
Author(s):  
Alexey Dorokhov ◽  
Alexander Aksenov ◽  
Alexey Sibirev ◽  
Nikolay Sazonov ◽  
Maxim Mosyakov ◽  
...  
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Automatic Control System ◽  
Technological Parameters ◽  
Post Harvest ◽  
Manual Sorting ◽  
Sorting System ◽  
Working Bodies ◽  
Automatic Removal

The roller and sieve machines most commonly used in Russia for the post-harvest processing of root and tuber crops and onions have a number of disadvantages, the main one being a decrease in the quality of sorting due to the contamination of working bodies, which increases the quantity of losses during sorting and storage. To obtain high-quality competitive production, it is necessary to combine a number of technological operations during the sorting process, such as dividing the material into classes and fractions by quality and size, as well as identifying and removing damaged products. In order to improve the quality of sorting of root tubers and onions by size, it is necessary to ensure the development of an automatic control system for operating and technological parameters, the use of which will eliminate manual sorting on bulkhead tables in post-harvest processing. To fulfill these conditions, the developed automatic control system must have the ability to identify the material on the sorting surface, taking into account external damage and ensuring the automatic removal of impurities. In this study, the highest sorting accuracy of tubers (of more than 91%) was achieved with a forward speed of 1.2 m/s for the conveyor of the sorting table, with damage to 2.2% of the tubers, which meets the agrotechnical requirements for post-harvest processing. This feature distinguishes the developed device from similar ones.

scholarly journals A pilot study comparing pattern of damage sustained among instruments from different surgical units in a tertiary care centre in Nepal – reappraising the role of instrument reprocessing in retaining their value

F1000Research ◽  
2018 ◽  
Vol 7 ◽  
pp. 102
Author(s):  
Sunil Munakomi ◽  
Roshan Shah ◽  
Sangam Shrestha
Keyword(s):  
Tertiary Care ◽  
Health Spending ◽  
Pivotal Role ◽  
World Health ◽  
Tertiary Care Centre ◽  
Surgical Equipment ◽  
Surgical Units ◽  
Wear And Tear ◽  
Health Organization

Background: The quality of instruments plays a pivotal role in governing safe operating room culture. The reprocessing system followed in the institution determines their durability thereby ensuring patient safety as well as minimizing health spending. Rigorous reprocessing in a centralized instrument reprocessing department by well trained staff following formulated guidelines helps to achieve the target of “safe surgery saves lives” as formulated by the World Health Organization. Methods: We sought to determine the patterns of wear and tear sustained among sets of surgical equipment from two surgical units that had been sent to the repair department within a year of their purchase. Analysis of similar changes in the joints of the instrument, as well as pattern of fractures sustained was performed. Results: All patterns of wear and tear were common in both the general surgical arm and neurosurgical counterpart, with the exception of fractures and mal-alignments. Similar study was performed examining changes in the joints. Stains were the most commonly observed change pattern in both sets of instruments. Fractures were most frequent in the working ends in both sets of instruments. Conclusion: There is an alarming incidence of wear and tear patterns in the instruments used in the surgical units, even within the first year of their use. This supports the strict implementation of reprocessing guidelines by well trained workers and their quality assessments via audit checks. The quality of the purchased instruments also plays a pivotal role.

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